Ferrite uses an optimized block state system that Lootr doesn't quite like. It did not like the change I made and wouldn't start, so I reverted it.

Lootr is overall causing massive tick problems on my modpack server, bolstered by ferritecore block optimization.

Is this a known issue?

I'll need more information:

• Do you have a Spark profile?
• What version of Minecraft?
• What modloader?
• What version of Lootr?

And what exactly was the error with Ferritecore?

Are you able to provide any more information about this?

This may be addressed in the most recent versions of Lootr for Forge 1.18/1.19. Please open a new issue if you still have problems.